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(11) |
EP 1 555 771 B1 |
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EUROPEAN PATENT SPECIFICATION |
| (45) |
Mention of the grant of the patent: |
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13.10.2010 Bulletin 2010/41 |
| (22) |
Date of filing: 31.03.1998 |
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| (51) |
International Patent Classification (IPC):
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| (54) |
Method and means for allocating time slots in a TDD system
Verfahren und Vorrichtung zur Zuweisung von Zeitschlitzen in einem TDD-System
Méthode et dispositif pour attribuer des intervalles de temps dans un système TDD
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Designated Contracting States: |
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DE FR GB |
| (43) |
Date of publication of application: |
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20.07.2005 Bulletin 2005/29 |
| (60) |
Divisional application: |
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10168939.6 / 2230779 |
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
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98105892.8 / 0948147 |
| (73) |
Proprietor: Sony Deutschland GmbH |
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10785 Berlin (DE) |
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| (72) |
Inventor: |
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- Izumi, Seiichi,
Sony Deutschland GmbH
70327 Stuttgart (DE)
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| (74) |
Representative: Körber, Martin Hans et al |
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Mitscherlich & Partner
Patent- und Rechtsanwälte
Postfach 33 06 09 80066 München 80066 München (DE) |
| (56) |
References cited: :
EP-A- 0 670 640
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US-A- 5 566 172
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- POVEY G J R ET AL: "A review of time division duplex-CDMA techniques" IEEE ISSSTA.
IEEE INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS, vol.
2, 2 September 1998 (1998-09-02), pages 630-633, XP002133410
- LAN CHEN ET AL: "A dynamic channel assignment algorithm for asymmetric traffic in
voice/data integrated TDMA/TDD mobile radio" PROCEEDINGS OF ICICS. INTERNATIONAL CONFERENCE
ON INFORMATION COMMUNICATIONS AND SIGNAL PROCESSING, 9 September 1997 (1997-09-09),
pages 215-219vol1, XP002076254
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| Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
|
[0001] The present invention relates to a communication method and unit for communicating
in a time division duplex communication system.
[0002] In a time division duplex communication system, examples of which are the GSM-standard
for outdoor mobile communication or the DECT-standard for indoor mobile telephone
communication, the receiving and the transmitting channels are separated on a time
basis. E.g. in the DECT-standard, the information is transmitted in time frames of
a length of 10 ms having 24 time slots. The first 12 time slots are used for the downlink
connection, that is the transmission of data from a base station to a mobile station.
The last 12 time slots are used for the uplink connection, that is for the transmission
of data from a mobile station to the base station. In the GSM-standard, a combination
of a frequency division duplex and a time division duplex is used. The information
is transmitted in time frames having 8 time slots, whereby the uplink connection is
provided in a lower frequency band and the downlink connection is provided in a higher
frequency band. Each of the 8 time slots in each frame is assigned to a different
mobile station. Thereby, the time slots assigned to a certain mobile station within
a downlink time frame are separated from the time slots assigned to the same mobile
station in the uplink time frame by two time slots. In other words, if e.g. the first
time slot in a downlink time frame is assigned to a certain mobile station, the fourth
time slot in an uplink time frame is assigned to the same mobile station. The time
basis separation of the uplink and downlink time slots enables the construction of
the mobile stations to be made more simple, since the reception and the transmission
of data does not take place simultaneously.
[0003] Since in telecommunication systems as e.g. the GSM-system the data transfer rate
is restricted, attempts have been made to increase the data transfer rate by allocating
more than one time slot per frame to a certain mobile station. In
JP 05153033-A such a TD digital mobile telecommunication system is disclosed, in which the same
frequency for transmitting and receiving information is used. 1 to N time slots within
one uplink time frame are allocated to one mobile station and 1 to N time slots within
one downlink time frame are allocated to one mobile station depending on the information
volume to be transferred between the mobile station and a base station.
[0004] Each frame is allocated either to the uplink transfer of data or the downlink transfer
of data. The uplink time frames cannot e used for a downlink transfer of data, so
that a strong asymmetric transmission of information with a large difference between
the amount of uplink data and the amount of downlink data is not possible.
[0005] In
JP 07107546-A, a TDMA radio communication system is disclosed, in which the ratio between the number
of uplink and downlink time slots within one time frame or one super frame consisting
of several time frames is changed according to the total amount of traffic between
a base station and mobile stations. In case of fast changing data transfer amounts,
the switching point within each frame between the uplink time slots and the downlink
time slots often changes position. Every change of such a switching point requires
a reallocation of several time slots for the different connected mobile stations.
This known systems therefore requires a complicated circuitry.
[0006] The slot allocation method disclosed in
EP 654916-A2 suffers from the same problems.
[0008] The document
EP 0 670 640 A discloses a radio communications system of the DECT type, whereby said system operates
with a TDMA/TDD structure and with time slots for transmission of, inter alia, data.
Moreover, two adjacent time slots are combined to form a double time slot.
[0009] The object of the present invention is therefore to provide a communication method
and a communication unit for transmitting and receiving information in a time division
duplex communication system, which allow a simple and efficient time slot allocation
for varying transfer information amounts.
[0010] The above object is achieved by a communication method according to claim 1 and a
communication unit according to claim 5. Advantageous features of the invention are
defined in the respective sub-claims.
[0011] In the following description, preferred embodiments of the present invention are
explained relating to the accompanying drawings, in which
figure 1 shows an example of a fixed block comprising one receiving time slot and
one transmitting time slot being located at the beginning of respective time frames,
figure 2 shows some time frames whith additional transmitting tine slots and additional
receiving time slots,
figure 3 shows some other time frames, wherein one of the time frames is saturated
with data to be transmitted or received, so that an additional switcching point is
present,
figure 4 shows an enlarged section of figure 3 showing a timing advance of an additional
transmitting time slot adjacent to a preceding receiving time slot, and
figure 5 shows a schematic example of a communication unit comprising a means for
allocating time slots according to the present invention.
[0012] In figure 1, three time frames F
1, F
2 and F
3 are schematically shown. Each frame contains e.g. eight time slots, as in a GSM-system.
Although all time frames shown in figure 1, 2 and 3 comprise eight time slots, the
present invention is not limited to this case and the time frames can comprise any
other required number of time slots. In each frame, the first two time slots 1 and
2 build a fixed block comprising a transmitting time slot 1 and a receiving time slot
2. In case that the present invention is implemented e.g. in a mobile station of a
telecommunication system, the transmitting time slot is an uplink time slot for transmitting
data or information from the mobile station to a base station, and the receiving time
slot 2 is a downlink time slot for transmitting data from the base station to the
mobile station. The transmitting time slot 1 and the receiving time slot 2 are thus
assigned to a certain pair of communication units, e.g. a base station and a mobile
station. The base station can thereby be part of the multiple access communication
system, in which one frame is assigned to several mobile stations. The fixed block
comprising the transmitting time slot 1 and the receiving time slot 2, however, is
always on a fixed position.
[0013] In the first and second frame F
1 and F
2 shown in figure 1, the six remaining time slots 3 to 8 in each frame are not used
for transferring information. Since the transmitting time slot 1 is placed in advance
of the receiving time slot 2, this slot allocation can cope with timing advance as
explained above. For a base station, the timing advance is adjusted by adjusting the
timing of the time slots transmitted from the base station to the mobile station.
[0014] In the example shown in figure 1, the first frame F
1, the next frame F
2 and the third frame F
3 are not saturated since only the transmitting time slot 1 and the transmitting time
slot 2 of the fixed flock are used to transfer information in each of the frames.
[0015] The last time slot 8 of the third frame F
3 is an additional transmitting time slot of the fixed block of the fourth frame F
4 of figure 4.
[0016] In figure 2, information are transmitted in the transmitting time slot 1 and the
receiving time slot 2 forming a fixed block in each of the shown frames F
4, F
5 and F
6, as in the first example shown in figure 1. However, since there is more information
to send and to receive, an additional transmitting time slot 8 is added before the
time slot 1 of the fixed block in the time axis direction. Additional receiving time
slots 3 and 4 are added behind the receiving time slot 2 in the time axis direction.
Thus, an increased amount of information or data can be transferred between a mobile
station and a base station or between several mobile stations and one base station.
In the later case, the additional transmitting and/or receiving time slots can be
allocated to different mobile stations. For example in the fifth time frame F
5, the additional receiving time slots 3, 4, 5 can be allocated to one or more different
mobile stations. The position of the basis block, however, remains unchanged, so that
the switching point between transmitting and receiving information, which is located
between the first time slot 1 and the second time slot 2 in each frame, remains on
the same position. This switching point is the only switching point, since the time
frames are not saturated with information to be transferred. As can be seen from figure
2, according to the present invention, the number of additional transmitting time
slots and additional receiving time slots an be increased independently, so that an
asymmetric transmission of data is possible. In case of a multiple access communication
system, in which one time frame is assigned to several mobile stations, the additional
time slots can be allocated to one or more different mobile stations. For a certain
mobile station, the time slots to be transmitted or received may not come in a regular
interval. However, the pattern of the slot allocation is maintained and continued
over at least several frames, e.g. two frames F
1 and F
2 as shown in figure 1. In figure 2, the slot allocation pattern changes for the succeeding
frames F
4, F
5 and F
6. The pattern of the slot allocation is advantageously not changed frame by frame,
but is changed only, when the required data amount to be transferred is changed. This
is the case for the time frame shown in figure 2, in which the data amount to be transferred
is reduced to one transmitting time slot from frame F
4 to frame F
5 and the receiving time slot 2 from frame F
5 to frame F
6.
[0017] In case of a multiple access communication system, in which different time slots
are assigned to different mobile stations, the time slots 3 and 4 being used as additional
receiving time slots and the time slot 8 being used as additional transmitting time
slot in the time frame F
4 can be assigned to a second mobile station, when the transmitting time slot 1 and
the receiving time slot 2 or the fixed block are assigned to a first mobile station.
The time slots 3 and 4 can also be allocated to a second mobile station and a third
mobile station, respectively.
[0018] In case that the amount of information to be transferred is further increased, the
maximum information transfer rate can e achieved by using all the time slots in each
time frame for transferring data, as shown in figure 3 for the time frame F
7. In the shown example, the transmitting time slot 1 and the receiving time slot 2
are still on their fixed position at the beginning of each time frame. The time slots
3 to 7 of the frame F
7 are used as additional receiving time slots. Thereby, the different time slots 3
to 7 can be assigned or allocated to different mobile stations. An additional transmitting
time slot 8 is also used in the time frame F
7, so that the last additional receiving time slot 7 and the succeeding additional
transmitting time slot 8 are adjacent to each other. If in this situation the base
station is located close to the mobile station, so that the propagation delay is small,
there is no serious problem. If, however, the base station is located far from the
mobile station, e.g. a few kilometre, the mobile station has to transmit the transmitting
time slot 8 in advance to compensate for the propagation delay. In other words, a
timing advance is necessary. Therefore, the mobile station has less time to receive
the last additional receiving time slot 7. This situation is shown in more detail
in figure 4. Figure 4 shows a section of figure 3 with the last additional receiving
time slot 7 and the additional transmitting time slot 8 of the preceding frame F
7 as well as the transmitting time slot 1 of the succeeding time frame F
8. As can be seen from figure 4, the last portion of the receiving time slot 7 is emptied
and used as a guard period to enable an earlier transmission of the additional transmitting
time slot 8. It has to be understood, that the timing advance problem only occurs,
when a receiving time slot and a succeeding transmitting time slot are adjacent to
each other, which are assigned to the same mobile station. It is therefore advantageous,
not to allocate successive transmitting and receiving time slots to one mobile station
in this case.
[0019] In time frame F
8 following time frame F
7 with the maximum information transfer, the amount of information to be transferred
is reduced and only the time slots 3, 4 and 5 are allocated as additional receiving
time slots. In the following time frame F
9, the amount of information to be transferred is further reduced to the basic block
comprising the transmitting time slot 1 and the receiving time slot 2.
[0020] In figure 5, a communication unit 10, in which the present invention is incorporated
or implemented, is schematically shown. The communication unit 10 can e.g. be a mobile
station or a base station of a mobile telecommunication system.
[0021] The communication unit 10 comprises an antenna 11, through which information modulated
onto respective carrier frequencies can be transmitted and received. The communication
unit 10 comprises a receiving means 12, which receives incoming information through
the antenna 11 and supplies the received information to a control unit 13, in which
the received information are demodulated, decoded, etc. In a known manner. The control
unit 13 comprises an allocation means 15, in which the time slots of the predetermined
time frames are allocated depending on the amount of information to be transferred
as receiving or transmitting time slots according to the method explained above. The
control unit 13 can thus also comprise a means for determining the amount of information
to be transferred, i.e. received or transmitted to give corresponding information
to the allocation means 15, so that the allocation means 15 correspondingly allocates
the time slots as receiving or transmitting time slots depending an the amount of
transfer information. The allocation means 15 of the control unit 13 allocates the
time slots according to the slot allocation method explained above in relation to
figures 1 to 4. Thereafter, the control unit 13 provides a transmission means 14 with
corresponding information to be transmitted within the correspondingly allocated time
slots by means of the antenna 11 to another communication unit. The control unit 13
can further comprise a guard period means 16, which, in case that an additional receiving
time slot and an additional transmitting time slot become adjacent to each other,
e.g. in the case shown in figures 3 and 4, provides a guard period in at least one
of said adjacent additional time slots. As stated above, this situation becomes only
relevant in the case that the preceding receiving time slot and the succeeding transmitting
time slot are assigned to the same communication unit 10. In this case it is advantageous,
if the guard period means 16 provides said guard period at the end of said additional
receiving time slots, e.g. the additional receiving time slot 7 of time frame F
7, shown in figure 3 and 4.
1. Communication method for transmitting and receiving information in a time division
duplex communication system, in which the information is transmitted in predetermined
time frames (F) having a predetermined number of time slots, said method comprising
the step of
allocating the time slots as receiving time slots and transmitting time slots, whereby
first a pair composed of a transmitting time slot and a receiving time slot directly
succeeding said transmitting time slot is allocated in each frame, whereby, when the
amount of information to be transferred is changed, the total number of allocated
time slots is changed dynamically by adding additional receiving time slots succeeding
said receiving time slot and by adding additional transmitting time slots preceding
said transmitting time slot,
further comprising the step of allocating at least the time slot (8) directly preceding
the first transmitting time slot (1) in the directly succeeding time frame (Fj+1) as an additional transmitting time slot dependent on the amount of information to
be transferred, wherein the last time slot of said time frame is not allocated as
receiving time slot and the allocation of the time slots has been carried out for
all the time slots of the frame, and
whereby
each time frame (F1, F2, ...) comprises
one of said additional receiving time slots, said additional receiving time slot being
directly succeeded by a transmitting time slot, said transmitting time slot being
one of said additional transmitting time slots or being part of the succeeding time
frame,
wherein
a guard period (17) is provided in said additional receiving time slot or said transmitting
time slot directly succeeding said addition receiving time slot, and said additional
receiving time slot and said transmitting time slot directly succeeding said additional
receiving time slot are assigned to the same communication unit (10).
2. Communication method according to claim 1,
further comprising
that the number of receiving time slots and the number of transmitting time slots
are independent from each other.
3. Communication method according to claim 1 or 2,
further comprising
that in said adjacent receiving and transmitting time slots a receiving time slot
(7) is preceding and a transmitting time slot is succeeding.
4. Communication method according to claim 3,
further comprising
that said guard period (17) is provided at the end of said receiving time slot (7).
5. Communication unit (10) for transmitting and receiving information in a time division
duplex communication system,
in which the information is transmitted in predetermined time frames (F) having a
predetermined number of time slots,
comprising
allocation means (15) for allocating the time slots as receiving time slots and transmitting
time slots, whereby first a pair composed of a transmitting time slot and a receiving
time slot directly succeeding said transmitting time slot is allocated in each frame;
determining means for determining an amount of information to be transferred, whereby
the slot allocation by the allocation means (15) is changed when the amount of information
to be transferred is changed,
wherein the total number of allocated time slots is changed dynamically by means of
said allocation means (15) adding additional receiving time slots succeeding said
receiving time slot and adding additional transmitting time slots preceding said transmitting
time slot,
whereby at least the time slot (8) directly preceding the first transmitting time
slot (1) in the directly succeeding time frame (Fj+1) is allocated as an additional transmitting time slot dependent on the amount of
information to be transferred, wherein the last time slot of said time frame is not
allocated as receiving time slot and the allocation of the time slots has been carried
out for all the time slots of the frame, and
whereby
each time frame (F1, F2, ...) comprises one of said additional receiving time slots, said additional receiving
time slot being directly succeeded by a transmitting time slot, said transmitting
time slot being one of said additional transmitting time slots or being part of the
succeeding time frame, wherein
a guard period means (16), which is part of said communication unit (10), provides
a guard period (17) in said additional receiving or said transmitting slot directly
succeeding said additional receiving time slot, and said additional receiving time
slot and said transmitting time slot directly succeeding said additional receiving
time slot are assigned to the same communication unit (10).
6. Communication unit (10) according to claim 5,
further comprising
that the number of receiving time slots and the number of transmitting time slots
are independent from each other.
7. Communication unit (10) according to claim 5 or 6,
further comprising
that in said adjacent receiving and transmitting time slots a receiving time slot
is preceding and a transmitting time slot is succeeding.
8. Communication unit (10) according to claim 7,
further comprising
that said guard period means (16) provides said guard period (17) at the end of said
receiving time slot (7).
1. Kommunikationsverfahren zum Übertragen und Empfangen von Information in einem Zeitmultiplex-Duplex-Kommunikationssystem,
bei dem die Information in vorher festgelegten Zeitrahmen (F) übertragen wird, welche
eine vorher festgelegte Anzahl von Zeitschlitzen haben, wobei das Verfahren den Schritt
aufweist des
Zuordnens der Zeitschlitze als Empfangszeitschlitze und Übertragungszeitschlitze,
wobei zuerst ein Paar, das aus einem Übertragungszeitschlitz und einem Empfangszeitschlitz
unmittelbar nach dem Übertragungszeitschlitz besteht, in jedem Rahmen zugeordnet wird,
wobei, wenn die zu übermittelnde Informationsmenge sich ändert, die Gesamtzahl zugeordneter
Zeitschlitze durch Hinzufügen zusätzlicher Empfangszeitschlitze nach dem erwähnten
Empfangszeitschlitz und durch Hinzufügen von zusätzlichen Übertragungszeitschlitzen
vor dem erwähnten Übertragungszeitschlitz dynamisch geändert wird,
weiterhin den Schritt aufweist des Zuordnens von zumindest dem Zeitschlitz (8) unmittelbar
vor dem ersten Übertragungszeitschlitz (1) in dem unmittelbar nachfolgenden Zeitrahmen
(Fj+1) als zusätzlichen Übertragungszeitschlitz abhängig von der zu übermittelnden Informationsmenge,
wobei der letzte Zeitschlitz des Zeitrahmens nicht als Empfangszeitschlitz zugeordnet
wird und die Zuordnung der Zeitschlitze für alle Zeitschlitze des Rahmens durchgeführt
wurde, und
wobei jeder Zeitrahmen (F1, F2,...),
einen der zusätzlichen Empfangszeitschlitze umfasst, wobei der zusätzliche Empfangszeitschlitz
unmittelbar von einem Übertragungszeitschlitz gefolgt ist, wobei dieser Übertragungszeitschlitz
einer der zusätzlichen Übertragungszeitschlitze oder Teil des nachfolgenden Zeitrahmens
ist,
wobei eine Sicherheitsperiode (17) in dem zusätzlichen Empfangszeitschlitz oder dem
Übertragungszeitschlitz unmittelbar nach dem zusätzlichen Empfangszeitschlitz vorgesehen
ist, und der zusätzliche Empfangszeitschlitz und der Übertragungszeitschlitz unmittelbar
nach dem zusätzlichen Empfangszeitschlitz der gleichen Kommunikationseinheit (10)
zugeordnet sind.
2. Kommunikationsverfahren gemäß Anspruch 1, weiterhin aufweisend, dass die Anzahl der
Empfangszeitschlitze und die Anzahl der Übertragungszeitschlitze unabhängig voneinander
sind.
3. Kommunikationsverfahren gemäß Anspruch 1 oder 2, weiterhin aufweisend, dass in den
benachbarten Empfangs- und Übertragungszeitschlitzen ein Empfangszeitschlitz (7) vorausgeht
und ein Übertragungszeitschlitz nachfolgt.
4. Kommunikationsverfahren gemäß Anspruch 3, weiterhin aufweisend, dass die Sicherheitsperiode
(17) an dem Ende des Empfangszeitschlitzes (7) vorgesehen ist.
5. Kommunikationseinheit (10) zum Übertragen und Empfangen von Information in einem Zeitmultiplex-Duplex-Kommunikationssystem,
bei dem die Information in vorher festgelegten Zeitrahmen (F) übertragen wird, welche
eine vorher festgelegte Anzahl von Zeitschlitzen haben, mit einer Zuordnungseinrichtung
(15) zum Zuordnen der Zeitschlitze als Empfangszeitschlitze und Übertragungszeitschlitze,
wobei zuerst ein Paar, das aus einem Übertragungszeitschlitz und einem Empfangszeitschlitz
unmittelbar nach dem Übertragungszeitschlitz besteht, in jedem Rahmen zugeordnet wird,
einer Bestimmungseinrichtung zum Bestimmen einer zu übertragenden Informationsmenge,
wobei die Schlitzzuweisung durch die Zuordnungseinrichtung (15) geändert wird, wenn
sich die zu übermittelnde Informationsmenge ändert,
wobei die Gesamtzahl zugeordneter Zeitschlitze dynamisch geändert wird indem die Zuordnungseinrichtung
(15) zusätzliche Empfangszeitschlitze nach dem erwähnten Empfangszeitschlitz und zusätzliche
Übertragungszeitschlitze vor dem erwähnten Übertragungszeitschlitz hinzufügt,
wobei zumindest der Zeitschlitz (8) unmittelbar vor dem ersten Übertragungszeitschlitz
(1) in dem unmittelbar nachfolgenden Zeitrahmen (Fj+1) als zusätzlicher Übertragungszeitschlitz abhängig von der zu übertragenden Informationsmenge
zugeordnet wird, wobei der letzte Zeitschlitz des Zeitrahmens nicht als Empfangszeitschlitz
zugeordnet wird und die Zuordnung der Zeitschlitze für alle Zeitschlitze des Rahmens
durchgeführt wurde und,
wobei jeder Zeitrahmen (F1, F2, ...) einen der zusätzlichen Empfangszeitschlitze umfasst, wobei der zusätzliche
Empfangszeitschlitz unmittelbar von einem Übertragungszeitschlitz gefolgt ist, wobei
dieser Übertragungszeitschlitz einer der zusätzlichen Übertragungszeitschlitze oder
Teil des nachfolgenden Zeitrahmens ist,
wobei eine Sicherheitsperiode-Einrichtung (16), die Teil der Kommunikationseinheit
(10) ist, eine Sicherheitsperiode (17) in dem zusätzlichen Empfangszeitschlitz oder
dem Übertragungszeitschlitz unmittelbar nach dem zusätzlichen Empfangszeitschlitz
bereitstellt, und der zusätzliche Empfangszeitschlitz und der Übertragungszeitschlitz
unmittelbar nach dem zusätzlichen Empfangszeitschlitz der gleichen Kommunikationseinheit
(10) zugeordnet sind.
6. Kommunikationseinheit (10) gemäß Anspruch 5, weiterhin aufweisend, dass die Anzahl
der Empfangszeitschlitze und die Anzahl der Übertragungszeitschlitze unabhängig voneinander
sind.
7. Kommunikationseinheit (10) gemäß Anspruch 5 oder 6, weiterhin aufweisend, dass in
den benachbarten Empfangs- und Übertragungszeitschlitzen ein Empfangszeitschlitz vorausgeht
und ein Übertragungszeitschlitz nachfolgt.
8. Kommunikationseinheit (10) gemäß Anspruch 7, weiterhin aufweisend, dass die Sicherheitsperioden-Einrichtung
(16) die Sicherheitsperiode (17) an dem Ende des Empfangszeitschlitzes (7) bereitstellt.
1. Procédé de communication pour transmettre et recevoir des informations dans un système
de communication à duplexage par répartition dans le temps, dans lequel les informations
sont transmises dans des tranches de temps prédéterminées (F) comportant un nombre
prédéterminé d'intervalles de temps, ledit procédé comprenant l'étape consistant à
allouer les intervalles de temps comme intervalles de temps de réception et intervalles
de temps d'émission, moyennant quoi d'abord une paire composée d'un intervalle de
temps d'émission et d'un intervalle de temps de réception suivant directement ledit
intervalle de temps d'émission est allouée dans chaque tranche, moyennant quoi, lorsque
la quantité d'informations à transférer est changée, le nombre total d'intervalles
de temps alloués est changé dynamiquement en ajoutant des intervalles de temps de
réception supplémentaires suivant ledit intervalle de temps de réception et en ajoutant
des intervalles de temps d'émission supplémentaires précédant ledit intervalle de
temps d'émission,
comprenant en outre l'étape consistant à allouer au moins l'intervalle de temps (8)
précédant directement le premier intervalle de temps d'émission (1) dans la tranche
de temps suivant directement (Fj+1) en tant qu'intervalle de temps d'émission supplémentaire en fonction de la quantité
d'informations à transférer, où le dernier intervalle de temps de ladite tranche de
temps n'est pas alloué comme intervalle de temps de réception et l'allocation des
intervalles de temps a été effectuée pour tous les intervalles de temps de la tranche,
et
moyennant quoi
chaque tranche de temps (F1, F2, ...) comprend
un desdits intervalles de temps de réception supplémentaires, ledit intervalle de
temps de réception supplémentaire étant directement suivi d'un intervalle de temps
d'émission, ledit intervalle de temps d'émission étant un desdits intervalles de temps
d'émission supplémentaires ou faisant partie de la tranche de temps suivante,
où
une période de protection (17) est prévue dans ledit intervalle de temps de réception
supplémentaire ou ledit intervalle de temps d'émission suivant directement ledit intervalle
de temps de réception supplémentaire, et ledit intervalle de temps de réception supplémentaire
et ledit intervalle de temps d'émission suivant directement ledit intervalle de temps
de réception supplémentaire sont affectés à la même unité de communication (10).
2. Procédé de communication selon la revendication 1,
comprenant en outre le fait que
le nombre d'intervalles de temps de réception et le nombre d'intervalles de temps
d'émission sont indépendants l'un de l'autre.
3. Procédé de communication selon la revendication 1 ou 2,
comprenant en outre le fait que
dans lesdits intervalles de temps de réception et d'émission adjacents, un intervalle
de temps de réception (7) est précédent et un intervalle de temps d'émission est suivant.
4. Procédé de communication selon la revendication 3,
comprenant en outre le fait que
ladite période de protection (17) est prévue à la fin dudit intervalle de temps de
réception (7).
5. Unité de communication (10) pour transmettre et recevoir des informations dans un
système de communication à duplexage par répartition dans le temps,
dans lequel les informations sont transmises dans des tranches de temps prédéterminées
(F) comportant un nombre prédéterminé d'intervalles de temps,
comprenant
un moyen d'allocation (15) pour allouer les intervalles de temps comme intervalles
de temps de réception et intervalles de temps d'émission, moyennant quoi d'abord une
paire composée d'un intervalle de temps d'émission et d'un intervalle de temps de
réception suivant directement ledit intervalle de temps d'émission est allouée dans
chaque tranche ;
un moyen de détermination pour déterminer une quantité d'informations à transférer,
moyennant quoi l'allocation d'intervalle par le moyen d'allocation (15) est changée
lorsque la quantité d'informations à transférer est changée,
où le nombre total d'intervalles de temps alloués est changé dynamiquement par le
biais dudit moyen d'allocation (15) ajoutant des intervalles de temps de réception
supplémentaires suivant ledit intervalle de temps de réception et ajoutant des intervalles
de temps d'émission supplémentaires précédant ledit intervalle de temps d'émission,
moyennant quoi au moins l'intervalle de temps (8) précédant directement le premier
intervalle de temps d'émission (1) dans la tranche de temps suivant directement (Fj+1) est alloué en tant qu'intervalle de temps d'émission supplémentaire en fonction
de la quantité d'informations à transférer,
où le dernier intervalle de temps de ladite tranche de temps n'est pas alloué comme
intervalle de temps de réception et l'allocation des intervalles de temps a été effectuée
pour tous les intervalles de temps de la tranche, et
moyennant quoi
chaque tranche de temps (F1, F2, ...) comprend un desdits intervalles de temps de réception supplémentaires, ledit
intervalle de temps de réception supplémentaire étant directement suivi d'un intervalle
de temps d'émission, ledit intervalle de temps d'émission étant un desdits intervalles
de temps d'émission supplémentaires ou faisant partie de la tranche de temps suivante,
où
un moyen de période de protection (16), qui fait partie de ladite unité de communication
(10), fournit une période de protection (17) dans ledit intervalle de temps de réception
supplémentaire ou ledit intervalle de temps d'émission suivant directement ledit intervalle
de temps de réception supplémentaire, et ledit intervalle de temps de réception supplémentaire
et ledit intervalle de temps d'émission suivant directement ledit intervalle de temps
de réception supplémentaire sont affectés à la même unité de communication (10).
6. Unité de communication (10) selon la revendication 5,
comprenant en outre le fait que
le nombre d'intervalles de temps de réception et le nombre d'intervalles de temps
d'émission sont indépendants l'un de l'autre.
7. Unité de communication (10) selon la revendication 5 ou 6,
comprenant en outre le fait que
dans lesdits intervalles de temps de réception et d'émission adjacents, un intervalle
de temps de réception est précédent et un intervalle de temps d'émission est suivant.
8. Unité de communication (10) selon la revendication 7,
comprenant en outre le fait que
ledit moyen de période de protection (16) fournit ladite période de protection (17)
à la fin dudit intervalle de temps de réception (7).

REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description
Non-patent literature cited in the description
- LAN CHEN et al.A dynamic channel assignment algorithm for asymmetric traffic in voice/data integrated
TDMA/TDD mobile radio, [0007]